<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>

</head>
<body>
<script>
    var socket;
    // 判断当前浏览器是否支付websocket
    if(window.WebSocket){
        // go on
        socket = new WebSocket("ws://localhost:7001/h");
        //
        socket.onmessage = function (ev) {
            var rt = document.getElementById("responseText");
            rt.value = rt.value + "\n" +ev.data;

        }
        // 相当于连接开启（感知到连接开启）
        socket.onopen = function (ev) {
            var rt = document.getElementById("responseText");
            rt.value = rt.value + "\n" + "连接开启了..";
        }
        // 相当于连接关闭（感知到连接关闭）
        socket.onclose = function (ev) {
            var rt = document.getElementById("responseText");
            rt.value = rt.value + "\n" + "连接关闭了..";
        }

    }else{
        alert("当前浏览器不支持websocket");
    }

    // 发送消息到服务器
    function send( message) {
        if(!window.socket){ // 先判断socket是否创建好
            return;
        }
        alert(socket.readyState== WebSocket.OPEN);
        if(socket.readyState == WebSocket.OPEN){
            // 通过socket 发送消息
            socket.send(message);
        }else{
            alert("连接没有开启");
        }
    }

</script>
    <form onsubmit="return false">
        <textarea name="message" style="height: 300px;width: 300px"></textarea>
        <input type="button" value="发送消息" onclick="send(this.form.message.value)"/>
        <textarea id="responseText" style="height: 300px;width: 300px"></textarea>
        <input type="button" value="清空内容" onclick="document.getElementById('responseText').value=''"/>
    </form>
</body>
</html>